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GH4780 alloy billet and forged piece and preparing method thereof

A technology of alloy and billet, which is applied in the field of GH4780 alloy billet and forging and its preparation, can solve the problems restricting the use of GH4780 alloy, and achieve the effect of uniform grain structure

Active Publication Date: 2019-12-20
BEIJING CISRI GAONA TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the GH4780 alloy prepared by the casting process is very prone to metallurgical defects, which restricts the use of the GH4780 alloy, and it needs to be prepared by the forging process

Method used

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  • GH4780 alloy billet and forged piece and preparing method thereof
  • GH4780 alloy billet and forged piece and preparing method thereof
  • GH4780 alloy billet and forged piece and preparing method thereof

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Effect test

preparation example Construction

[0035] A kind of preparation method of GH4780 alloy billet provided by the present invention comprises the following steps:

[0036] At 900-1160°C, the GH4780 alloy ingot is elongated and upset for at least two fires, with a deformation amount of 10%-50%, to break the columnar crystals, and complete the recrystallization process to obtain the GH4780 alloy billet.

[0037] The application carries out elongation and upsetting at a specific temperature, and obtains a GH4780 alloy billet after heat treatment. The grain structure of the obtained GH4780 alloy billet is uniform. After heat treatment, the average grain size reaches ASTM4 grade or finer. Among them, the elongation and upsetting temperature of multiple fires can be selected from 900 to 1160°C, such as 900°C, 950°C, 1000°C, 1050°C, 1100°C, 1150°C, and 1160°C. The elongation and upsetting of multiple fires are conducive to the completion of the crushing and recrystallization process of columnar crystals.

[0038] Prefera...

Embodiment 1

[0069] The GH4780 alloy ingot was smelted by the GH4780 double-combination process. After elongation and upsetting at 1150 ° C and subsequent multiple fire treatments, the deformation amount was 10% to 50%. The mechanical properties of the obtained billet are shown in Table 1.

[0070] Table 1 mechanical performance test results

[0071]

Embodiment 2

[0073] The GH4780 alloy ingot was smelted by the GH4780 double process. After elongation and upsetting at 1120°C and subsequent multiple fire treatments, the deformation amount was 10% to 50%. The mechanical properties of the obtained billet are shown in Table 2.

[0074] Table 2 mechanical properties test results

[0075]

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Abstract

The invention provides a GH4780 alloy billet and forged piece and a preparing method thereof. The method includes the following steps of breaking columnar crystals of a GH4780 alloy ingot at 900-1160DEG C, and conducting at least two heating numbers of drawing out and upsetting until the deformation reaches 10-50% to obtain the GH4780 alloy billet. The GH4780 alloy billet prepared through coggingand forging through the method is uniform in grain structure and has the average grain size of ASTM4 grade or higher after thermal treatment. By means of the preparing method of the GH4780 alloy forged piece, the GH4780 alloy forged piece can be prepared, the GH4780 alloy forged piece with the uniform structure is obtained, and the material support is provided for the development of aero-enginesand gas turbines. The GH4780 alloy forged piece is uniform in grain structure and has the average grain size of ASTM4 grade or higher after thermal treatment.

Description

technical field [0001] The invention relates to the technical field of nickel-based superalloy processing, in particular to a GH4780 alloy blank and forging and a preparation method thereof. Background technique [0002] Nickel-based superalloys are superalloys with nickel as the matrix (generally more than 50%) in the range of 650-1000 °C with high strength and good oxidation resistance and gas corrosion resistance. Nickel-based alloys are the most widely used and the highest high-temperature strength alloys among superalloys. The main reasons are that, firstly, more alloying elements can be dissolved in nickel-based alloys, and better structural stability can be maintained; secondly, coherent and ordered A 3 B-type intermetallic compound γ'[Ni 3 (Al, Ti)] phase is used as a strengthening phase to effectively strengthen the alloy and obtain higher high-temperature strength than iron-based superalloys and cobalt-based superalloys; the third is that nickel-based alloys cont...

Claims

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Application Information

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IPC IPC(8): C22F1/10C22C19/05B21J5/00
CPCB21J5/002C22C19/055C22F1/10
Inventor 曲敬龙谢兴飞张国栋杜金辉冯勇张华刘向宏吴永安谷雨安腾唐超毕中南
Owner BEIJING CISRI GAONA TECH
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